Assumption Creek Hydrologic Study

lower minnesota river watershed district, carver county, mn, 2021-2022

Background
The Lower Minnesota River Watershed District (LMRWD) is home to many unique natural resources, including trout streams. These rare waterbodies are considered valuable for their conditions that can serve as a natural ecosystem for trout. Trout streams need cold, calcium-rich water, supplied by a steady flow of groundwater. While these waters provide great value for recreation and habitat, they also have sensitive conditions that can be easily affected by human activities. The LMRWD had a growing concern for Assumption Creek, a trout stream southwest of Minneapolis, and whether the groundwater fueling its cool water was a finite resource.

Strengths & Solutions
Young Environmental led a detailed hydrology evaluation to better understand these conditions and the interaction of the creek and the watershed. Beginning with a desktop analysis, we compiled historic land use data and studied historical aerial photos. Reviewing soil data helped to understand how groundwater recharges in the area feeding the creek. Moving into the field, we filled in necessary fieldwork that was incomplete because of previous flooding, collecting flow measurements. Our team then developed HEC-RAS and HydroCAD models to understand the water flow and existing conditions.

Project Impact
The final report provides recommendations and opportunities to restore groundwater hydrology, which will protect habitat for trout fisheries and ensure the LMRWD successfully manages this resource.  

Water Resources Engineering, Hydrologic and Hydraulic Modeling, Fieldwork, Groundwater Management, Trout Stream Study